A rockfall block of Sioux Quartzite along the Bur Oak Trail in Blue Mounds State Park in Mound Township, Rock County, Minnesota. — Photo: Tim Kiser · CC BY-SA 4.0
Quartzite
The hard metamorphic rock formed when pure quartz sandstone is recrystallized by heat and pressure.
Intro adapted from Wikipedia (CC BY-SA).
Quartzite is a rock-forming material, with the chemical formula SiO₂ (metamorphic rock).
It crystallizes in the trigonal crystal system.
Key properties: Mohs hardness 7; typically white or gray or pink or red.
Collections: Everyday Minerals.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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